Designed in the 1940s by Albert Piguet at the Lémania workshops, the calibre CH 27 movement blank quickly won a reputation for its endurance and reliability. Its popularity ensured its further evolution into the highly refined calibre 2310. While column-wheel chronographs are notoriously difficult to make in general, the calibre 2310 has been made with particular exactitude to avoid any risk of juddering or seizure. Fine-adjustment screws set the right depth of engagement between toothed wheels, while a friction spring acts as a slight brake on chronograph hand to prevent it from juddering.
Such a movement has to have a case of classic design. The Classique Chronographe 5287 has a 42.5mm case in white or rose gold, with a dial displaying a central chapter of hours and minutes and the seconds with a double hand at 9 o'clock. The chronograph indications are an elapsed-minutes counter at 3 o'clock and the red central chronograph hand. A tachometer scale to calculate speed discreetly surrounds the Roman hour numerals.
The dial is engine-turned in a hobnail pattern in the centre and in a circular barleycorn motif for the double seconds. Snailing for the minutes counter and cross-hatching complete the dial decorations. This chronograph on a leather strap is water resistant to 3 bar (30m) and has a power reserve of 48 hours.